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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 0.25 // - 0.25
15/x-0.25 = 0
15*x^-1 = 0.25 // : 15
x^-1 = 0.01666667
-1 < 0
1/(x^1) = 0.01666667 // * x^1
1 = 0.01666667*x^1 // : 0.01666667
59.999988 = x^1
x = 59.999988
x = 59.999988
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